High Level vs. Low Level Signal


  • My head unit is the current model G12 with 8G/256G.  Vehicle is a 2018 Tundra.  I’m currently using the head unit’s internal amp to power the aftermarket dash tweeters, center channel and the factory external amp to power the aftermarket four mid bass drivers in the doors.  I’ve also added a Kicker mono amp to power a 10” subwoofer.  I’m using a pair of low level outputs to get a signal to the Kicker sub amp.  Caps and resistors have been added to the tweeters and dash center channel.  Resistors are utilized to balance the output with the mid bass drivers in the doors.  I’m very pleased with the overall sound quality although I could use a bit more volume on certain tracks and albums.

    I’m thinking of replacing the Toyota factory amp that currently powers the door’s mid bass drivers.  Currently, the stock factory amp receives a high level signal from the head unit via factory wiring.  The four channel amp I’m considering will take either a high or low level signal. From what I’ve read on a couple different forums, the low level output from Dasaita head units are subpar and using the high level speaker outputs will achieve better results.

    Have others found this to be true regarding using a high level signal from the head unit being the better option in getting a signal to my new 4-channel amp?



  • Can anyone currently utilizing low level outputs for mids and highs offer some feedback regarding overall sound quality and gain or the ability for the head unit to properly push the amp through the RCA's?  I currently have my sub amp pegged full open to get proper volume out of my sub.  In other words, I can't get my sub amp to clip with the gain offered from the low level output from the head unit.  


  • @Denis Hoshizaki Please go to Settings > About Machine and send us the current Build Number and MCU version.

    Besides, please go to Amplifier and crank up the bass settings.


  • Build number - QCM6125 12 S10A_123 eng.hct3.20240311.174711 NA

    MCU version - MTCH_HA4Z_V4.11_1

    My current issue is not gain with my sub amp.  If I replace my stock 4-channel amp, would I be better off using the head units high or low level output signal with a new 4-channel amp that accepts either input level?


  • @Denis Hoshizaki Our engineer said that they have reduce the low level output signal, we have reflected your issue to them and will try to recover it to a more pefect status. Once there is a new firmware released, we will put it to OTA and you could also download it from our furum. Your patience and understanding will be appreciated.

     


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